“…Double stimulation is usually related to the study of specific higher mental functions, in particular memory and attention (Damianova & Sullivan, 2011;Martin, 2012;Puzyrei, 2007) and, most frequently, concept formation (Hanfmann & Kasanin, 1937;Hedges, 2012;Kozulin, 1986;Macdonald, 2002;Towsey & Macdonald, 2009;Vaughan, 1981). Volition is one among the higher mental functions also discussed in the literature in connection to double stimulation (Engeström & Sannino, 2013;Kozulin, 1990) or, when double stimulation is not explicitly mentioned, in connection to the use of auxiliary stimuli (Aidman & Leontiev, 1991).…”